Malicious PDF — malware analysis report

Static analysis result for SHA-256 99616e337d74b140…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 10:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0c7ca42bab7ae83931e476c83da4c56 SHA-1: 509431728bd8ea1a699616c7f0febff7a8dc9be0 SHA-256: 99616e337d74b140dc029dbbf40bbcf1f57a9fea1359ecc1ee4faa476243a62f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a site that then serves further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://automsystem.com/UploadFile/file/20210924161319248.pdf In PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/lelidurasureruxuzela.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/93ea2a51f29a7ca8435311170b9f7eb8/talubetev.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/gurijurejajo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e9d77b48772c01a38406f178a09cbd9a/72963437130.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/sefaporipufukix.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/60077900727.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/fobomuvikupidikemuzazivo.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/8846088043.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf9fb46f95---96796300783.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/35235771930.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910090022.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/189059f1b1ac64d87802bd3e081544bc/movaga.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091403305851.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/57359043855.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/77052670650.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/56406862578.pdfIn PDF document text
    • http://atek-ent.com/upload/file/motoxedikifivosu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903195032_ijpjtz.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rijenirapaj.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/54848530959.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/61876181130.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/laralilebujotubozutuvivab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wd+s1+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCC 10116 bytes
SHA-256: 7c84a839e143768ab467cb8d737d1ee8f377dfffce76bea0ff68340110ff9361
font_01_sfnt_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 18680 bytes
SHA-256: a55f55259dbeab5fc029e0b2c610cea0f3dfa9c7ab93b947a2dab1d95f5fef94
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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